#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
using namespace std;

const int N = 1e6 + 10, INF = 0x3f3f3f3f;

int n, s;

void solve()
{
    cin >> n >> s;
    int mi = INF, mx = -1;
    for (int i = 1;i <= n;i++) {
        int x;cin >> x;
        mi = min(mi, x);
        mx = max(mx, x);
    }
    cout << min(abs(s - mi), abs(s - mx)) + (mx - mi) << '\n';

}

signed main()
{
    // ios::sync_with_stdio(0);
    // cin.tie(0);cout.tie(0);
#define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
    std::istringstream in(R"()");
    std::cin.rdbuf(in.rdbuf());
#endif
    int T = 1;
    cin >> T;
    for (int i = 1;i <= T;i++) {
        solve();
    }
}